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Chemistey Doubts

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MohammedNoor said:
http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_w07_qp_1.pdf


in q 3 answer is A but it should be B as i think can anyone help me out



plz

:) Noor :)

it's B
how can the X be chromatography?
hahaha..
 
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JmCullen said:
MohammedNoor said:
http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_w07_qp_1.pdf


in q 3 answer is A but it should be B as i think can anyone help me out



plz

:) Noor :)

it's B
how can the X be chromatography?
hahaha..


soo soorry by mistake took the mark scheme of may/june 2007
 
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MohammedNoor said:
JmCullen said:
MohammedNoor said:
http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_w07_qp_1.pdf


in q 3 answer is A but it should be B as i think can anyone help me out



plz

:) Noor :)

it's B
how can the X be chromatography?
hahaha..


soo soorry by mistake took the mark scheme of may/june 2007

hahaha.. it's ok..
btw, seriously! good luck tomorrow!
im damn scare.. >_<
 
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Unkownbunny said:
http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_s09_qp_1.pdf varient 2
Q6 and Q19. i didn't understand it because 03 and 02. shouldnt it be 0? how is it reduceD?

http://www.xtremepapers.me/CIE/Cambridg ... 8_qp_1.pdf
Q 30? where is carbon in the reactivity scale ?

http://www.xtremepapers.me/CIE/Cambridg ... 6_qp_1.pdf
Q 19. why not copper powder?

http://www.xtremepapers.me/CIE/Cambridg ... 3_qp_1.pdf
shouldn't MP be higher for covalent? why for the ionic bond?



Thanks in advance =) xxx


6) D, it's non-metal. so the electrons at the outer most shell will be 6 and 7

19) B. N2 and NO gain oxygen(oxidise). O3 lose 1 oxygen (reduce)

30) D. carbon is after aluminium before zinc

19) C. copper doesnt react with acid

err.. the paper in 2003 summer, which question are you talking about?
 
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Unkownbunny said:
oh im so sorry i forgot to mention that. Q8 =)
and thanks for the answers :D I get it now xx

it's ok!
so, do you still need the Q8 answer and explanation?
anyway, i'll write it down.
cuz im going to bed. just incase u need..

ok..
Q8) it's A. SrCl2 is ionic compound. and so, it has high melting point. and ionic compound is soluble in water :D

good luck for tomorrow!!! :beer:
 
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hey do I have to know how to calculate the limiting reagents ?

this is in the chemical reactions chapter
 
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moonlight22 said:
hey do I have to know how to calculate the limiting reagents ?

this is in the chemical reactions chapter

i think you need to know this for paper 3.
quite seldom they have limiting reagent question in paper 1.
but, to be secure, better you understand how to calculate it.
 
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gary221 said:
hey i got a doubt!!!


thnx!! :D

i think it's D..
coz potassium is high in reactivity.
and it is soluble.
barium sulphate is insoluble. so it can't dissolve in water.
 
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